:root {
  --primary-color: #007bff;
  --primary-dark: #003366;
  --light-bg: #f8fafb;
  --border-color: #e9ecef;
  --text-muted: #6c757d;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--light-bg);
  color: var(--primary-dark);
}

/* Cards */
.card {
  border: 1px solid var(--border-color);
  border-radius: 12px !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12) !important;
  transform: translateY(-2px);
}

/* Buttons */
.btn {
  border-radius: 8px !important;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.btn-outline-primary {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
}

/* Forms */
.form-control,
.form-select {
  border-radius: 8px !important;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.15);
}

/* Navbar */
.navbar {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.navbar-brand {
  font-size: 1.3rem;
  font-weight: 600;
}

/* Icons */
[data-lucide] {
  display: inline;
  vertical-align: middle;
}

/* Sidebar */
.sidebar {
  background-color: #f8f9fa;
  border-right: 1px solid var(--border-color);
  min-height: calc(100vh - 80px);
}

.sidebar .nav-link {
  color: var(--text-muted);
  border-left: 3px solid transparent;
  transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
  color: var(--primary-color);
  background-color: rgba(0, 123, 255, 0.08);
  border-left-color: var(--primary-color);
}

/* Tables */
.table {
  border-collapse: collapse;
}

.table thead th {
  background-color: var(--light-bg);
  color: var(--primary-dark);
  border-bottom: 2px solid var(--border-color);
  font-weight: 600;
}

.table tbody tr:hover {
  background-color: rgba(0, 123, 255, 0.05);
}

/* Alerts */
.alert {
  border-radius: 8px !important;
  border: none;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    min-height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .card {
    margin-bottom: 1rem;
  }
}